Geopolymer/CeO2 as Solid Electrolyte for IT-SOFC

Polymers

Ljiljana Kljajević¹  Miljana Mirković¹  Snežana Nenadović¹  Milan Kragović¹  Jelena Gulicovski¹  Marija Stojmenović¹  Marija Nišavić² 

[1] Laboratory for Materials Sciences, Institute of Nuclear Sciences Vinča, University of Belgrade, 11000 Belgrade, Serbia;Laboratory of Atomics Physics, Institute of Nuclear Sciences Vinča, University of Belgrade, 11000 Belgrade, Serbia;

关键词: polymer composites;    geopolymers/ceria;    electrical conductivity;    fuel cells;   

DOI  :  10.3390/polym12010248

来源: DOAJ

【 摘 要 】

As a material for application in the life sciences, a new composite material, geopolymer/CeO₂ (GP_CeO₂), was synthesized as a potential low-cost solid electrolyte for application in solid oxide fuel cells operating in intermediate temperature (IT-SOFC). The new materials were obtained from alkali-activated metakaolin (calcined clay) in the presence of CeO₂ powders (x = 10%). Besides the commercial CeO₂ powder, as a source of ceria, two differently synthesized CeO₂ powders also were used: CeO₂ synthesized by modified glycine nitrate procedure (MGNP) and self-propagating reaction at room temperature (SPRT). The structural, morphological, and electrical properties of pure and GP_CeO₂-type samples were investigated by X-ray powder diffraction (XRPD), Fourier transform infrared (FTIR), BET, differential thermal and thermogravimetric analysis (DTA/TGA), scanning electron microscopy (FE-SEM), energy dispersive spectrometer (EDS), and method complex impedance (EIS). XRPD and matrix-assisted laser desorption and ionization time-of-flight (MALDI-TOF) analysis confirmed the formation of solid phase CeO₂. The BET, DTA/TGA, FE-SEM, and EDS results indicated that particles of CeO₂ were stabile interconnected and form a continuous conductive path, which was confirmed by the EIS method. The highest conductivity of 1.86 × 10⁻² Ω⁻¹ cm⁻¹ was obtained for the sample GP_CeO₂_MGNP at 700 °C. The corresponding value of activation energy for conductivity was 0.26 eV in the temperature range 500−700 °C.

【 授权许可】

Unknown